Honeycomb Clevis Structure for High-Temperature Vibration Filtering
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Solution Overview
Problem
Existing vibration damping solutions for turbomachines, such as elastomer-based damping bearings, face limitations in temperature stability and durability, particularly failing at temperatures above 200°C and requiring frequent replacements due to elastomer degradation.
Innovation Solution
A clevis with a honeycomb-type annular portion providing enhanced compressive and flexural strain capacity, made from metal or composite materials, is used to filter vibrations, replacing traditional damping bearings and allowing operation at higher temperatures, and is produced through additive manufacturing techniques like selective melting of powder beds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomer-based damping bearings are used to filter vibrations, then vibration damping performance is improved, but temperature stability deteriorates above 200°C due to elastomer degradation
Solution Approach 1:
The patent changes the material parameter from elastomer to metal honeycomb structure, fundamentally altering the physical and chemical properties to achieve high-temperature stability while maintaining vibration filtering capability through the honeycomb geometry's inherent damping characteristics
Solution Approach 2:
The invention uses a metal honeycomb structure that combines the advantages of metallic materials (high-temperature resistance) with honeycomb geometry (vibration damping), creating a composite solution that outperforms traditional elastomer materials in thermal stability while maintaining damping functionality
2Reliability
If elastomer damping bearings are used, then vibration filtering is achieved, but durability worsens due to frequent replacement needs
Solution Approach 1:
The patent changes the material from degradable elastomer to thermally stable metal honeycomb structure, fundamentally improving the service life parameter by eliminating the degradation mechanisms that limit elastomer durability while maintaining effective vibration filtering
Solution Approach 2:
The invention replaces the disposable elastomer bearing with a durable metal honeycomb structure designed for long-term operation, reducing maintenance frequency and operational downtime while maintaining the essential vibration damping function
3Reliability
If traditional damping bearings are used, then vibration damping is provided, but device complexity increases due to separate bearing components
Solution Approach 1:
The patent merges the vibration damping function with the clevis body structure itself by integrating a metal honeycomb structure directly into the clevis, eliminating the need for separate bearing components and simplifying the overall device architecture while maintaining effective vibration filtering
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved thermal stability and reduced maintenance needs by filtering vibrations effectively at elevated temperatures, extending the lifespan of turbomachine components and reducing the frequency of replacements.
Implementation Method 1
a honeycomb-type annular portion forming a vibration filter and having a compressive and/or flexural strain capacity greater than that of the rest of the body
Data Source
AI summary
A clevis, particularly for a turbomachine includes a body that is attachable to a casing and at least one aperture for fitting a hinge pin. The body is formed in one piece and includes, about the at least one aperture, a honeycomb-type annular portion. The annular portion acts as a vibration filter and has a compressive and/or flexural strain capacity greater than that of the rest of the body.